996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

How much boost to set for K24/18G with Greddy Profec B Spec 2 & Turbo Timer ?

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  #16  
Old 03-24-2008 | 11:23 PM
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These turbos are great! I just took my car out this weekend for a test drive of the Proto air intake system I recently installed and the 24/18's were so responsive and pulled so strong up top. All this talk of K24 lag....I certainly don't have it and I think the car pulls harder with the intake.

And - it still needs the updated file for the intake - it is running a little rich at WOT with the old file, so there is more to come with the proper tune/file. The 1/4 mile will tell the story - it will be interesting to see if the time/trap improves due to the addition of the Proto air intake, Y-pipe, etc....
 

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Old 03-25-2008 | 12:05 AM
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Originally Posted by John D
These turbos are great! I just took my car out this weekend for a test drive of the Proto air intake system I recently installed and the 24/18's were so responsive and pulled so strong up top. All this talk of K24 lag....I certainly don't have it and I think the car pulls harder with the intake.

And - it still needs the updated file for the intake - it is running a little rich at WOT with the old file, so there is more to come with the proper tune/file. The 1/4 mile will tell the story - it will be interesting to see if the time/trap improves due to the addition of the Proto air intake, Y-pipe, etc....
John,
Do you feel the 75mm TB and the IPD plenum are worth getting and do they contribute to any more horsepower?

Vince
 
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Old 03-25-2008 | 12:54 AM
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Vince,

I think they are definitely worth getting if you are going the full 700 route with Y-pipe, as they will increase the HP and torque, but I am not sure otherwise. I did them in conjunction with so many other upgrades that it is impossible to tell what they contribute to the mix. I know that Todd recommends them in his 700 package and says they do improve the mid and top end. He did say that without an enlarged Y-pipe to feed the larger TB, it can't do much because the additional volume of air it can flow is not being supplied to it with the smaller OEM Y-pipe. That said, I did have it in conjunction with the OEM Y-Pipe last season and my car ran pretty strong. I would do it again.
 
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Old 03-25-2008 | 01:22 AM
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Originally Posted by John D
Vince,

I think they are definitely worth getting if you are going the full 700 route with Y-pipe, as they will increase the HP and torque, but I am not sure otherwise. I did them in conjunction with so many other upgrades that it is impossible to tell what they contribute to the mix. I know that Todd recommends them in his 700 package and says they do improve the mid and top end. He did say that without an enlarged Y-pipe to feed the larger TB, it can't do much because the additional volume of air it can flow is not being supplied to it with the smaller OEM Y-pipe. That said, I did have it in conjunction with the OEM Y-Pipe last season and my car ran pretty strong. I would do it again.
John,
Thanks for all the info. At this point I am just planning on getting to 600 Flywheel Horsepower. Going to set the Greddy Profec to 1.1 and strap it on the dyno and see what we get. I am trying to source the upgraded wastegate springs currently. What PSI spring do you have in your K24 18G wastegates?
 
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Old 03-25-2008 | 01:33 AM
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Originally Posted by RWDRIFTC2
John,
Thanks for all the info. At this point I am just planning on getting to 600 Flywheel Horsepower. Going to set the Greddy Profec to 1.1 and strap it on the dyno and see what we get. I am trying to source the upgraded wastegate springs currently. What PSI spring do you have in your K24 18G wastegates?
12 psi springs... meaning the WG will start opening at a minimum at 12 psi...
but with the greddy you can boost it up( assuming you have better gas).
 
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Old 03-25-2008 | 09:11 AM
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I run the IPD 70mm plenum and it helped alot. Hit me up Vince.
 
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Old 03-25-2008 | 03:25 PM
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1 bar on 93 octane


MK
 
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Old 03-25-2008 | 04:23 PM
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Mark, Marty,

I have been running 1.18 max on 93...Is this too much?
 
  #24  
Old 03-25-2008 | 04:33 PM
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just do 1.1 bars... and watch ur afrs...
 
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  #25  
Old 03-25-2008 | 04:54 PM
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Originally Posted by MARKSKI
just do 1.1 bars... and watch ur afrs...
Hello Markski!

1.1 is correct in a max for 91.
 
  #26  
Old 03-25-2008 | 11:01 PM
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Does 93 octane provide any meaningful difference from 91 or are they about the same?
 
  #27  
Old 03-25-2008 | 11:07 PM
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Originally Posted by John D
Does 93 octane provide any meaningful difference from 91 or are they about the same?
From what I know ... 1.1 bars on pump max..... I would even in your case drop it to 1 bar.... I would run 1.2 bars on 100 octane and 1.3 bars 1.3 or higher.... if u run C16 u can do 1.5 bars .... and of course take a peak at your afrs...
 
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  #28  
Old 03-26-2008 | 06:58 AM
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With my fuel system I run 1.1 bar on 93 oct and 1.4 bar on MS109 (103 oct)
Both of these work on my car fine for long, long pulls (ex 0-300 km was 27 seconds full throttle)


cheers,

MK
 
  #29  
Old 03-26-2008 | 01:08 PM
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Well just to muddle it up some more. I have been working with Todd at Protomotive, on the k24/18g kit, and for 91 octane he suggests 1 bar and for 93 and above 1.2 bar. This is what I will be setting mine at, once it gets here and installed.
 
  #30  
Old 03-26-2008 | 11:56 PM
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Thanks everyone for providing some helpful insight to my question.

I just ordered some custom wastegates for my K24 18G setup from Speed Gallery today. I think Sam said they are 1.2 bar. Should have them tomorrow. I think I will run 1.0 bar first at 91 octane and look at the A/F data first before deciding to boost it up.

On a side note if I was thinking of upgrading to the IPD plenum. Should I get the 75mm with a new throttle body, or just get the 70mm?
 


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